(See related pages)
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| Balancing Internal and External Validity | ||
( http://www.journals.apa.org/prevention/volume2/pre0020004c.html ) | ||
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| Center for Cross-Cultural Research | ||
( http://www.ac.wwu.edu/~culture/ ) | ||
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| CenterWatch Clinical Trials Listing Service | ||
( http://www.centerwatch.com/ ) | ||
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| Research Methods in Psychology | ||
( http://psychology.about.com/library/bl/blmethods.htm ) | ||
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| Society for Epidemiologic Research | ||
( http://www.epiresearch.org/ ) | ||
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